论文标题
Hestia项目:当地小组的模拟
The Hestia project: simulations of the Local Group
论文作者
论文摘要
我们介绍了Hestia模拟套件:附近区域的高分辨率环境模拟,这是当地组的一组宇宙学模拟。使用附近星系的特殊速度限制的初始条件被用来准确模拟局部宇宙学。在低分辨率中发现了类似于本地组的光环对,仅限制了暗物质,仅使用AREPO代码选择了更高分辨率的磁力流体动力模拟。重型物理学遵循星系形成的Auriga模型。模拟包含嵌入正确的宇宙学景观中的局部组中点的高分辨率区域的高分辨率区域。在该区域内,一个模拟的本地群体由银河系和仙女座(如星系形式)组成,其描述与观测非常吻合。模拟的当地组星系类似于银河系和仙女座的含量,质量比,出色的圆盘质量,形态学分离,相对速度,旋转曲线,隆起式式形态,卫星星系恒星质量功能,卫星质量质量,卫星径向分布以及某些情况下像岩石云一样的存在。由于这些模拟在同志环境中适当地对当地群体进行了建模,因此它们为环境被认为起着重要作用的问题提供了测试基础。
We present the Hestia simulation suite: High-resolutions Environmental Simulations of The Immediate Area, a set of cosmological simulations of the Local Group. Initial conditions constrained by the observed peculiar velocity of nearby galaxies are employed to accurately simulate the local cosmography. Halo pairs that resemble the Local Group are found in low resolutions constrained, dark matter only simulations, and selected for higher resolution magneto hydrodynamic simulation using the Arepo code. Baryonic physics follows the Auriga model of galaxy formation. The simulations contain a high resolution region of 3-5 Mpc in radius from the Local Group midpoint embedded in the correct cosmographic landscape. Within this region a simulated Local Group consisting of a Milky Way and Andromeda like galaxy forms, whose description is in excellent agreement with observations. The simulated Local Group galaxies resemble the Milky Way and Andromeda in terms of their halo mass, mass ratio, stellar disc mass, morphology separation, relative velocity, rotation curves, bulge-disc morphology, satellite galaxy stellar mass function, satellite radial distribution and in some cases, the presence of a Magellanic cloud like object. Because these simulations properly model the Local Group in their cosmographic context, they provide a testing ground for questions where environment is thought to play an important role.